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Method for synthesizing ZSM-35 molecular sieve

A ZSM-35, molecular sieve technology, applied in molecular sieve catalysts, chemical instruments and methods, iron conglomerate crystalline aluminum silicate zeolite, etc., can solve the problem of high prices of template agents and silicon and aluminum sources, and reduce production costs and methods. Simple, reproducible results

Active Publication Date: 2009-07-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] All of the above synthesis methods have the problem of high prices of template agents and silicon-aluminum sources

Method used

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  • Method for synthesizing ZSM-35 molecular sieve

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Kaolin (Suzhou Kaolin from China Kaolin Corporation, the same below) was roasted to 950°C (abbreviated as GL950, SiO 2 / Al 2 o 3 = 14.7).

[0016] 4.84g silica sol (containing 30wt% SiO 2 ) and 13.51g of deionized water were successively added to a 30ml crystallization kettle, stirred evenly, then 7.0gGL950 was added, fully stirred evenly, and 1.23gNaOH (30wt%) and 0.48g n-butylamine (NBA) were added dropwise with stirring to obtain a reaction Mixture, its molar ratio is:

[0017] SiO 2 0.033Al 2 o 3 0.07Na 2 O·15H 2 O 0.1NBA

[0018] The reaction mixture was stirred evenly, moved into a reaction kettle, and crystallized at 150°C for 48h under sealing. After cooling, the solid separated from the mother liquor. The separated solid was washed with deionized water until pH = 7-8, and dried at 100°C for 2 hours to obtain a sodium molecular sieve. The X-ray powder diffraction (XRD) crystal phase peak pattern was the same as that of the ZSM-35 standard spectrum, th...

Embodiment 2

[0020] 7.78g silica sol (containing 30wt% SiO 2 ) and 10.65g deionized water were successively added to a 30ml crystallization kettle, stirred evenly, then added 4.0gGL950, fully stirred evenly, and added 1.17gNaOH (30wt%) and 0.46gNBA with dropwise stirring to obtain a reaction mixture, its molar ratio for:

[0021] SiO 2 0.02Al 2 o 3 0.07Na 2 O·15H 2 O 0.1NBA

[0022] The reaction mixture was stirred evenly, moved into a reaction kettle, and crystallized at 150° C. for 48 h under sealing. After cooling, the solid separated from the mother liquor. The separated solid was washed with deionized water to refer to pH=7~8, and dried at 100° C. for 2 hours to obtain a sodium ZSM-35 molecular sieve. The X-ray powder diffraction (XRD) crystal phase peak type was identical to the ZSM-35 standard spectrum. That is, the obtained ZSM-35 molecular sieve.

Embodiment 3

[0024] 11.47g silica sol (containing 30wt% SiO 2 ) and 10.87g deionized water were successively added to a 30ml crystallization kettle, stirred evenly, then added 3.0gGL950, fully stirred evenly, and added 2.0gNaOH (30wt%) and 0.55gNBA with dropwise stirring to obtain a reaction mixture, its molar ratio for:

[0025] SiO 2 0.013Al 2 o 3 0.1Na 2 O·15H 2 O 0.1NBA

[0026] The reaction mixture was stirred evenly, moved into a reaction kettle, and crystallized at 150° C. for 48 h under sealing. After cooling, the solid separated from the mother liquor. The separated solid was washed with deionized water to refer to pH = 7-8, and dried at 100°C for 2 hours to obtain a sodium-type ZSM-35 molecular sieve. The X-ray powder diffraction (XRD) crystal phase had the same characteristics as the ZSM-35 standard spectrum, namely It is ZSM-35 molecular sieve.

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Abstract

The invention discloses a method for synthesizing a ZSM-35 molecular sieve, which is characterized by recovering and obtaining the ZSM-35 molecular sieve by taking n-butylamine as a template agent and kaolin as a whole aluminum source and a whole or a part of silicon source and subjecting a reaction mixture to hydrothermal crystallization at 140 to 190 DEG C, wherein in the reaction mixture, the SiO2 to Al2O3 molar ratio is between 12 and 100, the n-butylamine to SiO2 molar ratio is between 0.1 and 0.5, the Na2O to SiO2 is between 0.07 and 0.2 and the H2O to SiO2 molar ratio is between 12 and 30. The method uses cheap raw materials and can reduce production cost.

Description

technical field [0001] The invention relates to a method for synthesizing molecular sieves, more specifically a method for synthesizing ZSM-35 molecular sieves by hydrothermal method. Background technique [0002] ZSM-35 molecular sieve is a mesoporous zeolite with Ferrierite (FER) topological structure. It has a vertically intersecting two-dimensional channel system. The size of the ten-membered ring channel parallel to the [001] plane is 0.54nm×0.42nm. The size of the eight-membered ring channel parallel to the [010] plane is 0.48nm×0.35nm, which was first successfully developed by Mobil Corporation of the United States in 1977 (USP4016245). ZSM-35 can be widely used in various catalytic reactions of hydrocarbon conversion, such as aromatization, polymerization, isomerization, catalytic cracking, etc., and has a good application prospect. [0003] Like most molecular sieves, choosing a suitable substance as a template is one of the key factors in the synthesis of ZSM-35 m...

Claims

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Application Information

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IPC IPC(8): C01B39/44B01J29/65
Inventor 戴泳罗一斌王殿中
Owner CHINA PETROLEUM & CHEM CORP
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